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nbeerbower merged 1 commit into from
Jan 10, 2026
Merged

Add secure mode documentation #18

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22 changes: 22 additions & 0 deletions CLAUDE.md
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Expand Up @@ -299,6 +299,28 @@ Run `./setup-sandbox.sh` to check your system's security configuration:

Use `./setup-sandbox.sh --fix` to automatically fix common issues (requires root)

### Troubleshooting User Namespaces

If you see the message "User namespaces not available", enable them with:

```bash
# Standard Linux systems
sudo sysctl -w kernel.unprivileged_userns_clone=1

# Ubuntu 24.04+ (AppArmor restriction)
sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0
```

To make the change persistent across reboots:

```bash
# Standard Linux systems
echo 'kernel.unprivileged_userns_clone=1' | sudo tee /etc/sysctl.d/99-userns.conf

# Ubuntu 24.04+
echo 'kernel.apparmor_restrict_unprivileged_userns=0' | sudo tee /etc/sysctl.d/99-userns.conf
```

## Quick Start

```bash
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6 changes: 5 additions & 1 deletion setup-sandbox.sh
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Expand Up @@ -115,8 +115,12 @@ check_user_namespaces() {
check_fail "Unprivileged user namespaces disabled"
echo ""
echo " Enable with:"
echo " sudo sysctl kernel.unprivileged_userns_clone=1"
echo " sudo sysctl -w kernel.unprivileged_userns_clone=1"
echo " echo 'kernel.unprivileged_userns_clone=1' | sudo tee /etc/sysctl.d/99-userns.conf"
echo ""
echo " On Ubuntu 24.04+ (AppArmor restriction):"
echo " sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0"
echo " echo 'kernel.apparmor_restrict_unprivileged_userns=0' | sudo tee /etc/sysctl.d/99-userns.conf"

if $FIX_MODE; then
echo ""
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